DEPOSITION OF PHOTONIC CRYSTAL FILMS FOR USE IN THE ULTRAVIOLET SPECTRAL REGION
This work studies highly ordered photonic crystal films deposition from monodisperse polystyrene colloidal particles with a diameter of 100 nm, targeting the ultraviolet spectral range. We employed and compared two established self-assembly techniques: vertical lifting of the substrate from a colloidal solution and centrifugation (spin-coating). Possibility of varying the number of deposited layers (from a monolayer to several tens) and obtaining different crystallographic orientations of the photonic crystal face-centered cubic lattice relative to the substrate (mainly {111} planes and sometimes {100} planes parallel to the surface) was demonstrated. The obtained films are proposed as cost-effective templates for ultraviolet and soft X-ray nanolithography, fundamental substrates for all-dielectric ultraviolet metasurfaces and nanoantennas, as well as porous matrices for optical sensors in microfluidic systems.
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